I sbf'ed 2.1, factory reset, rooted, then updated to 2.2. I have root. I have many root apps currently installed. I have # access using terminal.

1. Root Explorer will not mount /system as R/W any longer. When I press the button it does nothing.

2. Autostarts, the awesome app which disables processes from starting at certain times, is no longer showing up in market. The latest version is supposed to be compatible with 2.2, so I'm uncertain what the problem is.

I had the same problem with Root Explorer not allowing me to select write/rewrite. Open the SuperUser app (The ninja guy), deselect Root Explorer, choose 'forget' and back out. Restart Root Explorer and choose 'allow' when prompted after an action.

The Root Explorer issue seems to have fixed itself. I noticed that if I click the R/W button in the root directory, then click the R/O, and only then go into /system and press the R/W button, everything worked.

For protected apps, replace your build.prop with the one in this thread. Now you can download everything. Note: this build.prop has stagefright enabled.